 /*******************************************************************************
  * Copyright (c) 2003, 2004 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Common Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/cpl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.core.internal.dependencies;

 import java.util.Collection ;

 /**
  * Not to be implemented by clients.
  */
 public interface IElementSetVisitor {

     public abstract Collection getAncestors(ElementSet node);

     public abstract Collection getDescendants(ElementSet node);

     public int getOrder();

     public abstract void update(ElementSet node);
 }
